/*
 * Copyright 2010 Askar Kalykov, oxygene.core@gmail.com
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package com.oxygenecore.processor.statement;

import com.oxygenecore.processor.*;

/**
 * @author Askar Kalykov
 *         Date: 11.09.2010
 *         Time: 16:38:00
 */
public class DeclareVariableStatement<T> implements Statement{

    private Expression<String> name;
    private Expression expression;
    private Expression<Class<T>> variableClass;

    public DeclareVariableStatement(LeafExpression<String> name, LeafExpression<Class<T>> variableClass, Expression<T> expression){
        if (name == null){
            throw new NullPointerException("name");
        }
        if (variableClass == null){
            throw new NullPointerException("variableClass");
        }
        if (expression == null){
            throw new NullPointerException("expression");
        }
        this.expression = expression;
        this.variableClass = variableClass;
        this.name = name;
    }

    public void execute(ExecutionContext executionContext) throws StatementException {
        try {
            Variable variable = new Variable(name.getValue(executionContext), variableClass.getValue(executionContext), expression.getValue(executionContext));
            executionContext.addVariable(variable);
        } catch (CalculationException e) {
            throw new StatementException(e, this);
        }
    }
}
